[build2] How can I store the result of external commands inside a buildfile

[Luiz Fernando Afra Brito]

Hello,

 I'm trying to use other programs to get some info about the cpu and pass
it to c++ during compilation. What I'm trying to do looks like this:

if($cxx.target.class == 'linux')
{
  obj{*}:
  {
    cxx.poptions += -DL1_SIZE=`/bin/getconf LEVEL1_DCACHE_SIZE`
    cxx.poptions += -DL2_SIZE=`/bin/getconf LEVEL2_CACHE_SIZE`
    cxx.poptions += -DL3_SIZE=`/bin/getconf LEVEL3_CACHE_SIZE`
    cxx.poptions += -DL4_SIZE=`/bin/getconf LEVEL4_CACHE_SIZE`
    ...
    # use some other linux program to get extra cpu information
  }
}
elif($cxx.target.class == 'windows')
{
  # call windows programs to get cpu information
}
elif($cxx.target.class == 'macos')
{
  # call mac programs to get cpu  information
}
...

In this example, I want to call /bin/getfonf to get cpu cache sizes,
probably I would need more information. In other OS's I would use other
programs to get this same information.

Can I get the result of external commands inside a buildfile? If not, there
is another approach to accomplish something similar?
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